Supplementary Information

Reduced Graphene Oxide by Chemical Graphitization

In Kyu Moon, Junghyun Lee, Rodney S. Ruoff, & Hyoyoung Lee

Contents

Supplementary Tables S1

Elemental analyses of Graphite, G-O and RG-OHI-AcOH powders

Supplementary Tables S2

Dispersion of the RG-OHI-AcOH powder in selected solvents with different polarity

indices

Supplementary Figure S1

Bulk quantity of RG-OHI-AcOH powder prepared from G-O Using the Solution-Phase

Supplementary Figure S2

Possible reduction mechanism and procedure for preparing the RG-OHI-AcOH platelets

Supplementary Figure S3

Solubility Test of RG-OHI-AcOH Powder

Supplementary Figure S4

Tyndall effect of RG-O

Supplementary Figure S5

Tapping mode AFM image and line scan of G-O platelets spin-coated on mica

Supplementary Figure S6

Tapping mode AFM image and line scan of RG-OHI-AcOH platelets deposited on SiO2

by spin-coating

Supplementary Figure S7

XPS data of GO, and RG-OHI-AcOH powder

Supplementary Figure S8

FT-IR spectra of G-O and RG-OHI-AcOH powders

Supplementary Figure S9

UV-Vis spectra of G-O and RG-OHI-AcOH platelets

Supplementary Figure S10

Conductivity of RG-OHI-AcOH graphene, chemically converted graphene (CCG),

chemically converted graphene (CCG2), and HRG

Supplementary Figure S11

Fabrication of G-O paper and VRG-OHI-AcOH paper

Supplementary Figure S12

Digital images of the apparatus for preparing VRG-ONH2NH2 paper

Supplementary Figure S13

Deconvoluted XPS C1s spectra

Supplementary Figure S14

Optical images of the surfaces

Supplementary Table S1 │ Elemental analyses of Graphite, G-O and RG-OHI-

AcOH powders.

Materials C O H N C/O C/(O+N)

Graphite 99.28 0.01 - - - -

G-O 44.56 46.43 2.13 0 0.96 -

RG-OHI-AcOH 82.63 7.21 0.64 0 15.27 15.27

Supplementary Table S2 │ Dispersion of the RG-OHI-AcOH powder in selected

solvents with different polarity indices35,36.

Solvents Polarity index

Stable Dispersion

of

RG-OHI-AcOH

DMF 6.4 yes

DMSO 7.2 yes

DMAc 6.5 yes

NMP 6.7 yes

CyH 4.5 no

CH3CN 5.8 no

THF 4.0 no

EtOH 5.2 no

toluene 2.4 no

DCB 2.7 no

DCM 3.1 no

Supplementary Figure S1 │ Bulk quantity of RG-OHI-AcOH powder prepared from

G-O Using the Solution-Phase.

Supplementary Figure S2 │ Possible reduction mechanism and procedure for

preparing the RG-OHI-AcOH platelets.

Supplementary Figure S3 │Solubility Test of RG-OHI-AcOH Powder. (a)

Photographs of RG-OHI-AcOH dispersed in a variety of solvents prepared by 2 h

sonication (RG-OHI-AcOH/solvents = 0.3 mg/10 ml; 9:1 volume ratio of solvent to DMF,

(b) The photographs were taken 1 week after preparing the RG-OHI-AcOH dispersion.

Supplementary Figure S4 │ Tyndall effect of RG-O. (a) Images of RG-OHI-AcOH, (b)

RG-ONH2NH2 colloidal dispersion in DMF (0.3 mg/10 mL) irradiated with a red laser

beam. The laser beam was strongly scattered.

Supplementary Figure S5 │ Tapping mode AFM image and line scan of G-O

platelets spin-coated on mica. A typical line scan of a single G-O platelet indicates

a thickness of ~ 1.0 nm.

Supplementary Figure S6 │ Tapping mode AFM image and line scan of RG-OHI-

AcOH platelets deposited on SiO2 by spin-coating. A typical line scan (red line) of

an RG-OHI-AcOH platelet indicates a thickness of about 0.66 nm. Two overlapped RG-

OHI-AcOH platelets (blue line) have a thickness of about 1.28 nm.

Supplementary Figure S7 │ XPS data of GO, and RG-OHI-AcOH powder. (a) XPS

survey scan of graphite, G-O, and RG-OHI-AcOH powder samples, (b) and (c)

deconvoluted C1s spectra of G-O, and RG-OHI-AcOH powders, respectively.

Supplementary Figure S8 │ FT-IR spectra of G-O and RG-OHI-AcOH powders.

The G-O and RG-OHI-AcOH powders were dispersed in KBr discs (1.0 mg/200.0 mg

KBr).

Supplementary Figure S9 │ UV-Vis spectra of G-O and RG-OHI-AcOH platelets.

The G-O and RG-OHI-AcOH powders were dispersed in DMF (0.1 mg/mL).

Supplementary Figure S10 │ Conductivity of RG-OHI-AcOH graphene, chemically

converted graphene (CCG)14, chemically converted graphene (CCG2)30, and

HRG13. A four-probe technique was used for the measurement at room temperature.

Supplementary Figure S11 │ Fabrication of G-O paper and VRG-OHI-AcOH

paper.(a) G-O paper pre-patterned (Circle), (b) Flexible G-O paper (Rectangle), (c)

Flexible G-O paper (Circle), (d) Preparation of bendable VRG-OHI-AcOH paper

exposed to a vapor emanating from the HI-AcOH solution, and (e) Pictures of the

bendable VRG-OHI-AcOH paper

Supplementary Figure S12 │ Digital images of the apparatus for preparing

VRG-ONH2NH2 paper. G-O paper (lower-left), and VRG-ONH2NH2 paper (upper-left) that

was obtained after exposure of the G-O paper to vapor emanating from the

hydrazine (35 wt% in water) container.

Supplementary Figure S13 │ Deconvoluted XPS C1s spectra. (a) VRG-ONH2NH2,

and (b) VRG-OHI-AcOH paper.

Supplementary Figure S14 │ Optical images of the surfaces. G-O paper (left),

VRG-OHI-AcOH paper (middle), and VRG-ONH2NH2 papers (right).

Supplementary References

35. http://www.sanderkok.com/techniques/hplc/eluotropic_series_extended.html (2007).

36. http://macro.lsu.edu/howto/solvents/Polarity%20index.htm (2010).